Grinding machine



Jul 23, 1935.

E. 1. BODEY GRINDING MACHINE Filed May 21, 1934 Patented July 23, 1935UNITED sTATEs PATENT 1 OFFICE GRINDING MACHINE Edward J. Bodey, Norwomohid Application May 21, 1934, Serial No. 726,719 Q 1 Claim. (01. 51--92) My invention relates to grinding machines,

especially to such employing a grind-stone or sand-stone in the grindingoperation. It is,

especially adapted for providing a compact'rel- 5 atively small unithaving a grind-stone sufliciently large and a capacity suflicientlygreat to perform ordinary grinding jobs thereon for a small shop,tool-room or training school, for sharpening carpenters tools either inthe shop or on the job, for use of butchers, for household use, and thelike.

It is the object of my invention to provide a device of this characteras a self-contained unit comprising the grinding wheel, an electricmotor, driving connections between the motor and the grinding wheel, anda tool-holder, all constructed and related for convenient use and formovement from place to place.

The invention will be further readily understood from the followingdescription and claim, and from the drawing, in which latter:

Fig. 1 is a side elevation of my improved device. Fig. 2 is a plan viewof the same. Fig. 3 is-an end elevation of the same, partly broken away.

Fig. 4 is a vertical section of a detail of the driving means, taken inthe plane of the line 44 of Fig. 2; and

Fig. 5 is a vertical section'of a detail, taken on the line 5-5 of Fig.2. A base H has a-water-tank l2 integral therewith at one corner and oneside thereof. The base and water-tank are preferably a single casting.The water-tank is provided with side walls I3, I45 A bracket l5 extends.integrally from the upper end of one of the side walls, and brackets l6extend integrally from the upper end of the other side wall of thewater-tank.

A shaft l8 extends crosswise of the upper end of the tank. One end ofthis shaft is journaled in a bearing I9 fixed to the bracket I5, and theother end of the shaft is journaled in a'bearing 20, which is part of ahousing 2!, the upper section 22 of which has said bearing therein andis provided with flanges 23 mating with flanges 24 on the lower section25 of said housing, bolts 26 being received through said flanges andclamping the same to the brackets l6 of the water-tank.

A grinding wheel 3| is secured to said shaft, as by'being clampedbetween flanges 32, 33 on said shaft, the flange 33 being fixed to saidshaft, and the flange 32 being slidable thereon and clamped toward theflange 33 by means of a nut 34 threaded to said shaft.

This grinding wheel is preferably a so-called grind-stone or sand-stone,and is preferably rotatable in the direction of the arrow 35, and is 4arranged to extend into a body 36 of lubricant or water in the tank, soas to perform so-called wet grinding with the grind-stone to avoidburning w" of tools being ground, one of which is exemplified as achisel 31. V

A hood M is arranged to be received about the rear upper portion of thegrind-stone above'the tank, and is arranged to direct lubricant carried10 upwardly by the wheel back into the tank, and to arrest theprojection of spray from the grindstone. The hood is secured to thetank.

A worm-wheel 45 is fixed to the grind-stone shaft, as by means of a key46. This worm-wheel 5 is mounted in the housing 2|. It is at the side ofthe tank above the free side of the. base; A double-threaded worm 41meshes with the wormwheel and is fixed to a drive-shaft .9 journaled inbearing sleeves 49, 5D in bearings 5!, 52 of the 20 section 25 of thehousing 2|. This drive-shaft extends alongside the tank in a directionsubstantially parallel with the plane of the grind-stone.

An electric motor 55 is fixed to the corner of the basediagonally'opposite to the corner which 25 supports the tank, andprojects laterally beyond the end of the tank for locating its axis ofrotation in line with the'axis of the rotation of the drive-shaft. Therotor of the electric motor is direct-connected with the drive-shaft 98by a 30 coupling 58. This coupling is preferably a resilient cushioncoupling, comprised for instance of end bushings 59, which are fixed tothe respective ends of the shafts 48, El, andare connected by aresilient sleeve 92; which may be of 'one end of the drive-shaft toresist said backlash and to cushion the same so as to prevent noise orjarring action upon the motor.

This resilient cushion is exemplified as a spiral 50 spring 66 havingone end thereof received about a positioning lug 67 in a hollow plug 68screwed into the threaded end 69 of the bore in the bearing 5| whichreceives the plug 68. The other end of the spring has one side of a ball19 received I! therein for positioning the ball outwardly from thespring, the other side of the ball being received in an end recess H inthe end of the driveshaft 48.

The power of the motor in driving the grindstone has a tendency to movethe worm endwise toward the motor, due to the resistance of the worm andworm-wheel in rotating the grind-stone during operation. When the switchfor the motor is opened and the electromotive force for the motor isthereby stopped, the grind-stone continues to rotate and then becomesthe driver for the drive-shaft and rotor of the motor, and has atendency to force the worm-wheel axially in the opposite direction,creating jarring and noise,

which is counteracted by the resilient cushioning device 65, so as toprovide fora quiet and noiseless stoppage of the grindstone.

A tool-holder I5 is supported on the outer end of the tank inself-contained relation to the rest of the device. It is exemplified ascomprising a yoke 16 having depending arms 'I! pivoted to the respectivesides of the tank on bolts 78, and adjustably positioned by beingprovided with arcuate slots 19, through which clamp bolts extend, theseclamp bolts being threaded into pads 8| on the respective side walls ofthe tank, the depending arms being clamped to the side walls in theadjusted positions of the yoke. Only one of these positioning devicesmay be employed.

A supporting rod 84 is fixed in lugs 85 at the respective ends of theyoke, and has a tool carrier 86 pivoted thereon on bearings 8'1. Thetool carrier has a tool-receiving gap 88 having end walls 89, a lowerwall 90 and a top plate SI releasably fixed to the end walls by screws92. An intermediate clamp plate 93 is located in the gap, which alsocontains the tool 31. A clamp screw 94 is threaded in a threaded hole 95of the upper plate for clamping against the clamp plate, clamping thetool between the clamp plate and the lower wall.

Anadjusting screw 96 is threaded in 2. lug 91 of the pivoted yoke, andis arranged to rest upon a track 98 of the yoke and to slide along said7 track with the yoke.

I The yoke is adjustable on its pivot toward the grinding wheel as thegrinding Wheel wears, so

tool at proper angle to provide the cutting end with a suitable taper orunder-cut grinding.

The carrier with the tool therein is shifted along the rod 84, with thelower end of the adjusting screw 96 riding on the track 98 for passingthe cutting edge of the tool back and forth across the face of thegrinding wheel in grinding the tool, with the tool maintained in correctposition for grinding. As the tool is ground the adjusting screw 96 isadjusted to bring the cutting end of the tool closer to the grindingwheel, or the tool may be adjusted lengthwise in its carrier.

The tool is readily examined by swinging the carrier rearwardly upon therod 84, with the assurance that upon swinging back the carrier intonormal position the tool will reassume its exact relation with thegrinding wheel after examination. 7

My improved device is simple and compact. The frame is sufficientlyheavy to hold it steady during operation. It provides means forsharpening tools without the danger of burning the cutting edgesthereof. ,It is readily moved bodily without disturbance of therelations of any of its parts, and the grind-stone, the motor and thedriving connection between the motor and the grind-stone are such that avery small motor provides ample power for the grind-stone, and so thatthe high speed of the motor is reduced in one step for proper rotativespeed of the grindstone in the grinding operation.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is:

In a grinder, the combination of an elongated base, an upwardlyextending support at one corner and one side of said base comprisingspacedapart walls, a grinding wheel shaft journaled on said support andextending crosswise of said base, a grinding wheel between said wallssecured to said shaft, an electric motor at the diagonally oppositecorner of said base having a rotor whose axis of rotation extendslengthwise of said base, said motor having a frame overlapping the planeextended lengthwise of said elongated base in which said support islocated, a drive-shaft direct-connected with said rotor and extendinglengthwise of said base at the side of said upwardly extending support,a worm secured to said drive-shaft, and a worm-wheel secured to saidgrinding wheel shaft and meshing with said worm, said worm, worm-wheeland drive-shaft located above the opposite side of said elongated base.

EDWARD J. BODEY.

